Two-stroke-cycle internal-combustion motor.



^ W. FRGEHLICH.K

y TWO-STROKE CYCLE INTERNAL COMBUSTIN MOTOR.

, APPLICATION FILED .IAN-26,1915. 19168987?, Patented Jan.1s,1916.

2 SHEETS-)SHEET l.

. l W. FROEHLICH. TwoLsTnoKE CYCLE INTERNAL cpmpusloN Moron.

APPLICATION FILED IAN26 19I5 Patented Jan. 18, 1916.

A 2 SHEETS-SHEET 2.

v Y Mfr/wg.

WILHELM FROEHLICH, OF WANNSEE, EAR BERLIN, GERMANY.

TWO-STROKE-CYCLE INlI'ERNAL-COMBUSTON MOTORI'.

meseta.

Specification of Letters Patent.

Application led .Tanuary26, 1915. Serial No. 4,558.

To all 'whom t may concern:

Be it knownl that I, WILHELM FRoEHLroH, a subject of the King ofPrussia, residing at l1 Tristanstrasse, Wannsee, near Berlin, Germany,have invented certain new and useful Improvements in Two-Stro'ke-CycleInternal-Combustion Motors, of which the following is a specification.

My invention relates to internalcombustion motors working in atwo-stroke cycle, and more especially to the type of motors with anumber of cylinders arranged parallel to each other around a hollowcentral shaft.

According to my invention the hollow shaft serves as' an intermediatereceptacle for the scavenging air and for the gas and air mixture. Itfurther serves asa distributingtvalve for the admission of thescavenging air and the mixture to the cylinders and for governing thefeed pumps drawing in and compressing the air and the mixture. The shafttherefor directly governs the suction and compression channels ofthe airand mixture pumps and the admission channels as well as, by aid of camsand annular valves, the exhaust channels ofthe cylinders.

The drawingsv aflixed to thisspeciication show the preferred form of amotor according to my invention.

Figure 1 is a vertical longitudinal'section on the line K--L (Fig. 2),the points, where the scavenging air and mixture pumps are connected tothe hollow central shaft, being' shown in a horizontal section on lineM--N (Fig. 4).- v Fig. 2 -isa 'section on the line A-B-C-D-E (Fig. l),Fig. 3 is a section on the line F-GH-.J (Fig. 1), Fig. 4 is a section onthe line O--P (Fig. 1).

1-are .four cylinders rigidly fastened to the engine bed and surroundingthe rotatable central shaft 2. Two pistons 3 and 4 in each cylinderworking in opposite directions are o eratively connected by rods 5 withso-callidd reeling rings 6 mounted on sphericalbodies 6a connected withthe central shaft so as to impart to said bodies and to the shaftconnected with them a movement of rotation.

In the position shown in Fig. 1 the explosive mixture inlet 7surrounding the shaft 2 is connected by a port 8 in the hol'low shaft 2with an annular chamber (suction chamber) 9 provided insaid shaft.Chamber 9 is connected with the channel 11 of the casing leading to thelower cylinder 1, by the port 10 which coincides with channel 11. Thepiston 3 of the lower cylinder-l having completed its return stroke fromthe right to the left has drawn nixture into the cylinder. At the sametime the piston 3 inthe upper cylinder has pressed the mixture drawn inat a former phase through channel 11 and port 28 into the interior 0fshaft 2, the part at the right of the partition 12 of said shaftservingas an intermediate receptacle for the gas and air mixture. In theposition shown in the'drawingpiston 4 of the lower cylinder havingcompleted its stroke from the left to the right has drawn in air throughthe open left-hand end and through the cen'- tral tube 13 and port 14 ofshaft 2. At the same time piston 4 of the upper cylinder in moving fromright to left has pressed the air` drawn in at a former phase throughchannel 15 and port 29 into the chamber provided at the left of thepartition 12in the shaft, this chamber extending across the annularchamber surrounding tube 13 into the spherical body carrying theleft-hand reeling ring 6.

Patented Jaun. 18, 1916.

The chamber at the right of the .partition 12 of the shaft having .thusbeen filled with gas and air mixture and the left-hand chamber withcompressed air, the admission of scavenging air and gas and air mixtureinto the motor will take place in the following manner: When at the endof the expansion of the gasesignited between'the pistons 3 and 4 of theupper cylinder the piston'4 uncovers inlet 16, a cam 30 on shaft 2having caused the annular valve 17 governing the exhaust to Vopen theexhaust ports 18, the ports 19 arranged in the wall of the 1eft7 handchamber coincide with corrponding vports inthe fixed casing surroundingthe shaft. As shown in the drawings the valve 17 for each cylinder is inthe form of a band encircling the cylinder between suitable ides, andpassngabout a shaft 17a, 17", 1I? or 17d on the casing` or frame of theengine, said shafts being provided with rollers 17e which extend into'the path of the cam" 30. s the shaft 2 revolves the valve rollers willbe moved outward, effecting a movement of the band 1 7 sufficient toopen the ports 18, each of sald valves bemg returned toY its closedposition as the cam palsses from engagement with the correspo dingroller. The compressed airstored within the hollow shaftnow passesthrough ports 19,'channel 20 and 16 into the upper cylinder anddisplaces the burnt gases causing them to escape through the ports 18.`

` -When the piston 4 of the upper cylinder has reached the finalposition represented in the drawing, the ports 21 provided in the wallof the right hand chamber in the shaft come in front of the casingchannel 22 and the compressed mixture contained within the shaftentering the cylinder through channel 22 and inlet 16 displaces thescavenging air and fills the cylinder, whereupon the exhaust ports 18are closed by the annular valve 17 governed by cam 30 on shaft 2, Theadmission of gas and air mixture is continued u 'itil piston 4 hasclosed the inlets 16, wherein` on a port 23 in the wall of the` `shaft2which surrounds the suction chamber coincides with a port 24 connectedwith suction chamber 9 of the shaft. Therefore the reopening of theinlet 16 by the short piston 4 cannot cause any losses of mixture, themixture having been forced out of the y. channel 22 and this channel aswell as the channel 20 containing nothing but air.

In ,the Ajoints between the shaft and the walls of the compressedmixture chambers of the casing surrounding it an annular y groove 26 isprovided, said groove being con- Vnected by a narrow opening 26a withthe suction chamber M9 of the shaft. This arrangement serves forpreventing a loss of mixture in case that the joints between the shaftand the casing shouldbecome loose. the compressed mixture being pressedfirst of all into the annular groove 26 and` being drawn from it throughthe opening into the suction chamber 9. A similar annular grooveprovided at 27 is similarly connected with the suction chamber.

I claim 1. In a two-stroke cycle motor, the combination'of a hollowshaft, a plurality of cylinders arranged around saidshaft', pistonslconnecting said suction chamber for the mixture with the mixturepassage.

2l vIn a two-stroke cycle motor, the combination of a hollow shaft, aplurality of cylinders arranged around said shaft, pistons within thecylinders, means connected with the pistons'for rotating the shaft,separate intermediate storage chambers and suction chambers forscavenging air and for a mixture of air and gas within said shaft,passages for conducting scavenglng a1r, and

said mixture from the shaft to the cylinders, means for introducing themixture into a cylinder, means for immediately thereafter connectingsaid mixture suction chamber with the mixture channel, and means `for.simultaneously connecting the mixture channel with the intermediatestorage chamber for scavenging air.'

3. In a two-stroke cycle internal-combustion motor, -the combination ofa hollow shaft, -a plurality of cylinders arranged around the shaft,pistons within the cylinders, means connected with the pistons forrotating the shaft, separate intermediate storage chambers and suctionchambers for scavenging airand for a mixture` of gas and air arrangedwithin the shaft, a casing surrounding'the shaft,passages in said`casing for conducting scavenging air, and a mixture of gas and air fromthe shaft to the cylinders, compressed mixture chambers in the fixedcasing surrounding the shaft, annular grooves in the ]oints between thewalls of the last said chambers and the shaft,

and a connection between said grooves and the suction chamber within theshaft.I

In testimony whereof I aiix myv signature in presence of. two witnesses.

WILHELM FROEHLICH. Witnesses:

WOLDEMAR HAUPT, HENRY HAsrER.

